Xanadu

"Xanadu" is the title song from the album Xanadu, the soundtrack to the 1980 film of the same name.

When Roger gets a job on a cruise ship where the Smiths are taking their vacation in "The Vacation Goo", Roger appears as Olivia Newton-John and sings her hit Xanadu with ad-libbed lines while serving tables.

Lyrics
Xanadu

Can't cry on cue

Now I am here

In Xanadu

(To old lady)

Here you go ma'am, I talked to the chef.

There's no cream in the soup just like you asked for.

Xanadu...